Cartier Santos de Cartier Large Skeleton Steel Blue Strap Watch WHSA0021. Stainless steel 47.5mm x 39.7mm case and bezel all on a blue leather strap and comes complete with complimentary black strap. This men's watch features a skeleton dial with luminescent coating. Synthetic sapphire crystal glass and water resistant up to 100m. Power reserve up to 72 hours. Manual-wind movement.